Regarding discrete integration through ode45

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Varad
Varad 2011-4-6
Hi,
I am studying a software written in simulink, which includes the signal integration block. The entire system is in a closed loop, where the current input to the integration block is dependent on the previous value given at the output of the block. Basically, the input to the block is a complex function. It is mentioned in the solver pane that the ode method used is ode45.
My intention is to convert the entire simulink block to a pure MATLAB/C code. Is it possible to know how the discrete integration is implemented by MATLAB/Simulink?
Thank you, Varad.

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Arnaud Miege
Arnaud Miege 2011-4-6
Can I ask why you want to convert the Simulink model to MATLAB or C code?
Simulink use complex semantics and mechanisms to solve the underlying mathematical equations of the system (see How Simulink Works and Choosing a Solver in the documentation for more details). It's not possible to convert a Simulink model to MATLAB code, which is why I ask what are the reasons for doing so.
It is however possible to automatically generate C code from Simulink models with Real-Time Workshop. This is typically for embedding control or signal processing algorithms onto real-time embedded systems, but can also be use for speeding-up simulations, integrating in larger simulation environments, batch processing, etc...
HTH,
Arnaud
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Varad
Varad 2011-4-6
Hi Arnaud,
My main intent is to convert the whole software to C. The main reason is that some of the functions the MATLAB part implements are very slow, and I have managed to optimize a great deal of it in C. However, the simulink part is the toughest to translate. Also, since I am translating manually, I'd really like to understand how it works. Is that possible?
Thanks for your time,
Varad Deshmukh
Arnaud Miege
Arnaud Miege 2011-4-7
I wouldn't recommend doing a manual translation. Express your software in Simulink and then use Real-Time Workshop to generate the C code. Once the model is configured correctly to generate the C code, it's very easy to make modifications to the model and regenerate the code, rather than having to manually recode it and introducing potential coding errors.
Arnaud

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